Belt adjuster



Sept 30, 1930- R. l.. cRosBY 1,776,996

BELT ADJUSTER Filed Oct. 25, 192B API- INVENTOR. puff. 1.. Gaggia'.

ATTORNEY.

x Patentedi Sept. 0, 1,930

PATENT OFI-*lcs RALPH L. caesar; or HIGHLAND PARK, MICHIGAN q'amrmausrnn Application iiled October 25, 1928.; Serial No. 314,884.

My invention relates to a new and useful improvement in a belt adjusterand is illustrated in the drawings as applied to a fanbelt for drivingthe cooling fan of an internal o combustion engine.` F rornthedescriptlon,

however, it will appear evident that the invention is adapted for use asa belt-adjuster on various types of mechanism.

lt isan object of the present invention to l@ provide a belt adjusterhaving a pair of belt engaging parts, relative movement of which willeffect adjustment of the belt.

Another object of the invention is the provision of a pair ofgroove-forming, relatively movable members for engaging the belt,relative movement of which will effect adjustment of the tautness of thebelt.

Another object of' the invention is the provision of a pair ofrelatively movable belt engaging inembers, each provided with aninclined slot directed oppositely to the ineline in the other andarranged for relative movement upon unitary rotation. j

V @ther objects will appear hereinafter.

The invention consists in the combination and arrangement of partshereinafter .described and claimed. j

The invention will be best understood by a reference to the accompanyingdrawings 3@ which form a part of this specification and in which, v

Fig. 1 is a side elevational view of the invention applied, with partsbroken away.

Fig 2 is a central vertical sectional view of the invention.

Fig. 3 is a sectional view taken on line 3-3 of Fig. 2.

Fig. 4 is a fragmentary side elevational view of the invention.

The invention as illustrated'in the drawings is adapted for use with ahub 9 which is adapted for mounting upon a shaft 10 upon which the fan11 is fixedly mounted. Projecting inwardly of the hub 9 is a threadedboss 12 into which is threaded a set screw 13 projected through an elonated slot 14.`

` 'formed in the cylindrical mem er 15 and projected through-theelongated slot 16 formed in the cylindrical member 17 ,The cylindri- 50cal member 17 embraces the cylindrical member 15 andis provided with anoutwardly pressed portion to provide a channel 18 in which the outwardlypressed boss 19 on the member 15 engages. Formed on the end of themember 17 is an inclined flange 20 which 55 kis inclined in the oppositedirection to the flange 21 whichgis formed on the end of the member 15;a Wedge-shaped belt 22 serves to drive the hub 9 and engages the innerfaces of the flanges 20 and 21. on

The engagement of the boss 19 in the passage 18 will prevent relativerotation of the cylindrical members 15 and 17 but will not preventrelative axial movement of thesemembers. l If these\members are rotatedin unison on the hub 9, the engagement of the screw 13 in the slots 14and 16 will eii'ect relative axial movement of the members 15 and 17 soas to cause the flanges 20' and 21 to approach or withdrawdepending'upon the direction of rotation. As/these flanges withdraw, itis evident that thefbelt will thereby be loosened as it will bepermitted to set more deeply in the channel between the flanges 20 and21. Arelative approach of the fianges 20 and 21 will effect the reverseoperation. Consequently, the flanges 2O and 21 together form a pulleyover which the belt 22 rides.

By moving both of the fianges-20 and'21, a centering of the pulley isalways,y provided so that ift will cause al minimum amountof wear l onthe belt l22.

While I have illustrated and described the preferred ormof my invention,'I do not B5 wish,to limit myself to the precise details of structureshown but desire to avail vmyself of such variations and modificationsas may comel within the scope of the appended claims. y f '90 y Havingthus described'my invention, what I claim asnew and desire to secure byLetters Patent is: l

1. A belt adjuster of the class described, comprising: a pair oftelescoping sleeves, 95 each having an elongated slot formed therein,said slots being inclined oppositely to each other and crossing; ahubdor supporting said sleeves; a set screw threaded into said hub andproj ected through said slots; and a flange 10* vln on one end of eachof said sleeves, said flanges being normally in spaced relation andform- Iing a pulley.

2. A belt adjuster of the class described,

com rising: a air of telesco in sleeves eachr having an elongated slotormed therein, said slots being inclined oppositely to each other andcrossing; a hub for su porting said sleeves; a set screw threaded intosaid hub and projectedthrough said slots; and a ange on one end of eachof said sleeves, said flanges being normally in spaced relation andforming a V-type pullely, ythe rotation of said sleeves on said hub eecting relative movement of said flanges.

In testimony whereof I have signed the foregoing specification.

y RALPH L. CROSBY.

